Solar and solar wind properties determined from 30 years of OMNI data

Details Solar and solar wind properties determined from 30 years of OMNI data Solar and solar wind properties determined from 30 years of OMNI data

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh51a..02r&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH51A-02

Other

2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2164 Solar Wind Plasma

Scientific paper

Spacecraft have explored the heliosphere for over 40 years, providing a rich set of data to determine significant periods and spectral characteristics of the sun and solar wind. Here we use the hour averages from many spacecraft that have been collected in the "OMNI" dataset to determine spectra and other properties over five decades in frequency. Significant findings include: (1) The 11-year solar cycle is apparent, as expected, in the magnitude of the magnetic field and some other quantities, but not in the transverse (to the radial) fields and flows; (2) The dominant energy in fluctuations from the scale of years to a fraction of a day is contained in the variation in the radial flow speed; (3) There is a strong, modulated, annual variation in many quantities, especially the radial magnetic field and velocity, and some evidence for other approximately annual oscillations; (4) The dominance of the northern magnetic field polarity is apparent at times in the smoothed radial field; (5) Solar minimum and solar maximum are often quite distinct time periods with a fairly sharp transition; (6) There is no "quasi-static" regime for solar wind fluctuations but rather the transverse magnetic and velocity fluctuations are comparable in energy at essentially all scales; and (7) The average synodic period of solar coronal hole rotation is 27.04 ± 0.07 days as determined from many harmonics of the rotation period in both magnetic and velocity data.

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